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    <title>计科2411胡鑫乐07</title>
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    <ins><i>斜</i><b>粗<sup>1</sup></b></ins><p></p>
    e<sub>x</sub>=1+x+c<sub>2</sub>/2<del>等于</del>1+x+x<sub>2</sub>/2
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        1+1=2
            1+2=3
                1+3=4
        1+2+3+4=4+3+2+1
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